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Rapid combined synchronization/demodulation structures for DS-CDMA systems. I. Algorithmic developments
Psaromiligkos, I.N.; Batalama, S.N.; Medley, M.J.;
Communications, IEEE Transactions on
Volume 51,
Issue 6,
June 2003
Page(s):983
-
994
Abstract:
Blind adaptive linear receivers are considered for the demodulation of direct-sequence code-division multiple-access signals in asynchronous transmissions. The proposed structures are self-synchronized in the sense that adaptive synchronization and demodulation are viewed and treated as an integrated receiver operation. Two computationally efficient combined synchronization/demodulation schemes are proposed, developed, and analyzed. The first scheme is based on the principles of minimum-variance distortionless-response processing, while the second scheme follows the principles of auxiliary-vector filtering and exhibits enhanced performance in short data-record scenarios. In both cases, the resulting receiver is a linear structure of order exactly equal to the system processing gain. Simulation studies included in this paper demonstrate the coarse synchronization as well as the bit-error rate performance of the proposed strategies.
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